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1 September, 00:23

Write the expression as the sine, cosine, or tangent of an angle.

cos 8x cos 2x - sin 8x sin 2x

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Answers (2)
  1. 1 September, 00:46
    0
    Cos (A - B) = cos (A) cos (B) - sin (A) sin (B)

    Thus,

    cos (8x) cos (2x) - sin (8x) sin (2x)

    = cos (8x - 2x)

    = cos (6x)
  2. 1 September, 03:15
    0
    Cos 8x cos 2x - sin 8x sin 2x = 1/2 sqrt (2+sqrt (3)
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